cpuid_gnu.h 2.4 KB

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  1. /*
  2. * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #ifndef _CPUID_GNU_H_
  32. #define _CPUID_GNU_H_
  33. #ifdef __cplusplus
  34. extern "C" {
  35. #endif
  36. /* This is a PIC-compliant version of CPUID */
  37. static inline void cpuid(int *eax, int *ebx, int *ecx, int *edx)
  38. {
  39. #if defined(__x86_64__)
  40. asm("cpuid"
  41. : "=a" (*eax),
  42. "=b" (*ebx),
  43. "=c" (*ecx),
  44. "=d" (*edx)
  45. : "0" (*eax), "2" (*ecx));
  46. #else
  47. /*on 32bit, ebx can NOT be used as PIC code*/
  48. asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
  49. : "=a" (*eax), "=r" (*ebx), "=c" (*ecx), "=d" (*edx)
  50. : "0" (*eax), "2" (*ecx));
  51. #endif
  52. }
  53. static inline void __cpuid(int a[4], int b)
  54. {
  55. a[0] = b;
  56. a[2] = 0;
  57. cpuid(&a[0], &a[1], &a[2], &a[3]);
  58. }
  59. static inline void __cpuidex(int a[4], int b, int c)
  60. {
  61. a[0] = b;
  62. a[2] = c;
  63. cpuid(&a[0], &a[1], &a[2], &a[3]);
  64. }
  65. #ifdef __cplusplus
  66. }
  67. #endif
  68. #endif /*_CPUID_GNU_H_*/